Abstract A composite metamaterial honeycomb that exhibits sign-switching expansion coefficients has been introduced herein, in which at certain conditions the microstructures display resemblances of an ancient Islamic art. This is achieved by the use of two types of materials within each unit cell: a cross rod of very high expansivity and a frame linkage of insignificant expansivity. When the frame linkage material is of zero expansivity, sign-toggling of the thermal and moisture expansions occurs at the original state such that any deviation from the original environmental condition always result in overall shrinkage of the metacomposite. The capability of this metacomposite to exhibit sign-flipping of expansion coefficients not only demonstrates the tunability of composite properties in situ, but also to do so across opposing signs without any active control. In addition, the currently introduced metamaterial design pays homage to an ancient Islamic pattern.

中文翻译：

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受伊斯兰图案启发的具有符号变化的湿热膨胀系数的复合结构

摘要 本文介绍了一种具有符号转换膨胀系数的复合超材料蜂窝，在某些条件下，其微观结构显示出与古代伊斯兰艺术的相似之处。这是通过在每个晶胞内使用两种类型的材料来实现的：具有非常高膨胀率的横杆和具有微弱膨胀率的框架连杆。当框架连杆材料的膨胀系数为零时，热膨胀和湿膨胀的符号切换发生在原始状态，因此与原始环境条件的任何偏差总是会导致复合材料的整体收缩。这种元复合材料表现出膨胀系数符号翻转的能力不仅证明了原位复合材料特性的可调性，但也可以在没有任何主动控制的情况下跨越相反的标志。此外，目前引入的超材料设计向古老的伊斯兰图案致敬。